1 /* $NetBSD: aio.h,v 1.13 2016/04/09 19:55:33 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 2007, Mindaugas Rasiukevicius <rmind at NetBSD org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _SYS_AIO_H_ 30 #define _SYS_AIO_H_ 31 32 #include <sys/types.h> 33 #include <sys/signal.h> 34 35 /* Returned by aio_cancel() */ 36 #define AIO_CANCELED 0x1 37 #define AIO_NOTCANCELED 0x2 38 #define AIO_ALLDONE 0x3 39 40 /* LIO opcodes */ 41 #define LIO_NOP 0x0 42 #define LIO_WRITE 0x1 43 #define LIO_READ 0x2 44 45 /* LIO modes */ 46 #define LIO_NOWAIT 0x0 47 #define LIO_WAIT 0x1 48 49 /* 50 * Asynchronous I/O structure. 51 * Defined in the Base Definitions volume of IEEE Std 1003.1-2001 . 52 */ 53 struct aiocb { 54 off_t aio_offset; /* File offset */ 55 volatile void *aio_buf; /* I/O buffer in process space */ 56 size_t aio_nbytes; /* Length of transfer */ 57 int aio_fildes; /* File descriptor */ 58 int aio_lio_opcode; /* LIO opcode */ 59 int aio_reqprio; /* Request priority offset */ 60 struct sigevent aio_sigevent; /* Signal to deliver */ 61 62 /* Internal kernel variables */ 63 int _state; /* State of the job */ 64 int _errno; /* Error value */ 65 ssize_t _retval; /* Return value */ 66 }; 67 68 /* Internal kernel data */ 69 #ifdef _KERNEL 70 71 /* Default limits of allowed AIO operations */ 72 #define AIO_LISTIO_MAX 512 73 #define AIO_MAX (AIO_LISTIO_MAX * 16) 74 75 #include <sys/condvar.h> 76 #include <sys/lwp.h> 77 #include <sys/mutex.h> 78 #include <sys/pool.h> 79 #include <sys/queue.h> 80 81 /* Operations (as flags) */ 82 #define AIO_LIO 0x00 83 #define AIO_READ 0x01 84 #define AIO_WRITE 0x02 85 #define AIO_SYNC 0x04 86 #define AIO_DSYNC 0x08 87 88 /* Job states */ 89 #define JOB_NONE 0x0 90 #define JOB_WIP 0x1 91 #define JOB_DONE 0x2 92 93 /* Structure of AIO job */ 94 struct aio_job { 95 int aio_op; /* Operation code */ 96 struct aiocb aiocbp; /* AIO data structure */ 97 void *aiocb_uptr; /* User-space pointer for identification of job */ 98 TAILQ_ENTRY(aio_job) list; 99 struct lio_req *lio; 100 }; 101 102 /* LIO structure */ 103 struct lio_req { 104 u_int refcnt; /* Reference counter */ 105 struct sigevent sig; /* Signal of lio_listio() calls */ 106 }; 107 108 /* Structure of AIO data for process */ 109 struct aioproc { 110 kmutex_t aio_mtx; /* Protects the entire structure */ 111 kcondvar_t aio_worker_cv; /* Signals on a new job */ 112 kcondvar_t done_cv; /* Signals when the job is done */ 113 struct aio_job *curjob; /* Currently processing AIO job */ 114 unsigned int jobs_count; /* Count of the jobs */ 115 TAILQ_HEAD(, aio_job) jobs_queue;/* Queue of the AIO jobs */ 116 struct lwp *aio_worker; /* AIO worker thread */ 117 }; 118 119 extern u_int aio_listio_max; 120 /* Prototypes */ 121 void aio_print_jobs(void (*)(const char *, ...) __printflike(1, 2)); 122 int aio_suspend1(struct lwp *, struct aiocb **, int, struct timespec *); 123 124 #endif /* _KERNEL */ 125 126 #endif /* _SYS_AIO_H_ */ 127